WPF C# Classes, TextBox and Reference, Easy(?) "does not exist in the current context"

Question

Hi, I'm pulling my hair out. I have created a class "employee.cs". I developed this class originally within the "public partial class Window1 : Window" on "Window1.xaml.cs". When moving it to a sepate class I can no longer refernce textBoxes, comboBoxes etc. What do I do?? Error given is "The name 'textBox1' does not exist in the current context". I'm sure its simple! Thanks Guys!

Here's a cut back example!

Window1.xaml

<Window x:Class="WpfApplication6.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
  <Grid>
    <TextBox Height="100" Margin="12,12,23,0" Name="textBox1" VerticalAlignment="Top" />
  </Grid>
</Window>

Window1.xaml.cs

namespace WpfApplication6
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            textBox1.Text = "testing"; //Works Here!
        }
    }
}

Class.cs

namespace WpfApplication6
{
    class class1
    {
        public static void main()
        {
            textBox1.Text = "Help"; //Doesn't Work Here!! :-(
        }
    }
}

Answer 1

x:Class="WpfApplication6.Window1 in the xaml Tells you this is part of the Window1 class. The window (from xaml) will be come a partial member of that class.

Answer 2

As the other answer here implies, you're going to need to change your class attribute in the Window XAML.

    <Window x:Class="WpfApplication6.class1"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Title="Window1" Height="300" Width="300">  
      <Grid>    
         <TextBox Height="100" Margin="12,12,23,0" 
                  Name="textBox1" VerticalAlignment="Top" />  
      </Grid>
    </Window>

This change should make your textbox references work.